linux-kernel - [PATCH 1/7] tracing: Add trace_array_find() to find instance trace arrays

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Message-Id: <ae87b48837528e5dba7e6cff962a2c431754862d.1576679206.git.zanussi@kernel.org>
Date:   Wed, 18 Dec 2019 09:27:37 -0600
From:   Tom Zanussi <zanussi@...nel.org>
To:     rostedt@...dmis.org
Cc:     artem.bityutskiy@...ux.intel.com, mhiramat@...nel.org,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: [PATCH 1/7] tracing: Add trace_array_find() to find instance trace arrays

Add a new trace_array_find() function that can be used to find a trace
array given the instance name, and replace existing code that does the
same thing with it.

Also make it available for use outside of trace.c.

Signed-off-by: Tom Zanussi <zanussi@...nel.org>
---
 kernel/trace/trace.c | 30 ++++++++++++++++++++----------
 kernel/trace/trace.h |  1 +
 2 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 23459d53d576..5483b50a11ff 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8455,6 +8455,21 @@ static void update_tracer_options(struct trace_array *tr)
 	mutex_unlock(&trace_types_lock);
 }
 
+/* Must have event_mutex and trace_types_lock held */
+struct trace_array *trace_array_find(const char *name)
+{
+	struct trace_array *tr, *found = NULL;
+
+	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+		if (tr->name && strcmp(tr->name, name) == 0) {
+			found = tr;
+			break;
+		}
+	}
+
+	return found;
+}
+
 static struct trace_array *trace_array_create(const char *name)
 {
 	struct trace_array *tr;
@@ -8531,10 +8546,8 @@ static int instance_mkdir(const char *name)
 	mutex_lock(&trace_types_lock);
 
 	ret = -EEXIST;
-	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
-		if (tr->name && strcmp(tr->name, name) == 0)
-			goto out_unlock;
-	}
+	if (trace_array_find(name))
+		goto out_unlock;
 
 	tr = trace_array_create(name);
 
@@ -8658,12 +8671,9 @@ static int instance_rmdir(const char *name)
 	mutex_lock(&trace_types_lock);
 
 	ret = -ENODEV;
-	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
-		if (tr->name && strcmp(tr->name, name) == 0) {
-			ret = __remove_instance(tr);
-			break;
-		}
-	}
+	tr = trace_array_find(name);
+	if (tr)
+		ret = __remove_instance(tr);
 
 	mutex_unlock(&trace_types_lock);
 	mutex_unlock(&event_mutex);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 63bf60f79398..f37ef6524821 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -346,6 +346,7 @@ extern struct mutex trace_types_lock;
 
 extern int trace_array_get(struct trace_array *tr);
 extern int tracing_check_open_get_tr(struct trace_array *tr);
+extern struct trace_array *trace_array_find(const char *name);
 
 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
-- 
2.14.1